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T: Fachverband Teilchenphysik

T 1: QCD and electroweak interactions (theory)

T 1.8: Vortrag

Montag, 15. März 2021, 17:45–18:00, Ta

Mixed NNLO QCD×electroweak corrections of O(N_fα_sα) to single-W/Z production at the LHC — •Jan Schwarz¹, Stefan Dittmaier¹, and Timo Schmidt² — ¹Albert-Ludwigs-Universität Freiburg — ²Universität Würzburg

Owing to its clean experimental signature and its high cross section the Drell–Yan-like W/Z production is among the most important processes at the LHC. Drell–Yan-like processes can be used for a variety of applications, e.g., for detector calibration or measuring the W-boson mass and beyond that are also an important SM background for searches of new physics. On the theoretical side the O(α_sα) corrections seem to be the largest missing fixed order part, and in recent years it has been possible to get a handle on these corrections in the vicinity of the pole corresponding to the on-shell production of Drell–Yan-like W/Z bosons using, e.g., so-called pole approximations (PA). However, since new physics like the production of Z′ or W′ might show up for example in the tails of invariant mass spectra, the theoretical uncertainty on the SM background has to be controlled in these off-shell regions of phase space where the PA is not applicable. Therefore, a full off-shell calculation of the O(α_sα) corrections is desirable. In this talk we present results on the radiative corrections of order O(N_fα_sα) for the off-shell production of W or Z bosons at the LHC, where N_f is the number of fermion flavours. These corrections form a gauge-invariant part of the next-to-next-to-leading-order corrections of mixed QCD×EW type and include all diagrams at O(α_sα) with closed fermion loops.